Red-vs-Blue first-person boxy tank game
 

Forever ago, I downloaded a demo for a 3D first-person tank combat game focused on combat between boxy red tanks and boxy blue tanks. IIRC the controls were entirely with the keyboard and there was a damage-displaying diagram at the bottom, and in multiplayer it was fairly easy to flip the tank and take damage from rolling. The audio wasn't anything too impressive, and the graphics remind me of Stunts, but the gameplay was fairly nice and there were many types of weapons to use. The game's name started with an "A" and the game's icon was a red blocky tank by default.

Hmm, Assault Rigs perhaps?

Not quite; the game I'm talking about didn't have anything flashy as far as graphics go. Very close, though.

I swear I've seen this game, at Abandonia even, but I don't remember the name. Anyway there might be many very similar games. A google search shows modern mobile games about combat between a red and a blue tank.

Yeah, but this one seems to have a "teambased" singleplayer, i.e. you work *with* red tanks and *against* blue tanks.